Improvement in stop-valves



Stop-Valves. N0,149,330. Patented Aprl7,1874.

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Stop-Valves.

No.149,330. Patented Aprn 7l, 1874.

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CHARLES F. MURDOGK, OF DETROIT, MICHIGAN.

IMPROVEMENT IN STOP-VALVES.

lSpecification forming part of Letters Patent No. 149,330, dated April 7, 1874; application tiled March 17, 1874.

To all whom t may concern:

Be 1t known that I, CHARLES F. MURDooK,

l of Detroit, in the county of Wayne and State at rightA angles t0 the axis of the pipe. The

invention consists in constructing the case or body With an opening in its side instead of its end, as usual, through which to introduce the valve-plates, whereby the valve is rendered lighter and cheaper and its interior rendered accessible ,while it is in use. The invention further consists in a peculiar form and arrangement of the brace, by which the valve-plates are forced up to their seats, and in a peculiar manner of constructing said plates, as hereinafter fully explained.

Figure 1 isla longitudinal central section of iny valve closed; Fig. 2, an end elevation of the same; Fig. 3, alongitudinal central section of the same open; Fig. 4, a view of the neck and stuffing-box surrounding the valve-stem; Figs. 5 and 6, back face views of two forms of one of the valve-plates 5 Figs. 6 and 8, edge views of the same; Figs. 9 and 10, respectively, an end and a side view of the brace by which the valve-plates are forced apart against their seats. v

A represents the body or case of the valve, made of the same general form as those now in common use, and consistingof amain or central portion, a,'having two necks, b, to receive the ends of the connecting-pi pe, two internal annular seats, c, for the valve-plates to bear upon, and a lateral extension, d, into which the valve-plates pass as they slide from their seats. B and C are the valve-plates, which are caused to slide in the body and to bear upon the respective seats c, in the manner and by the means hereinafter described. As these valveplates are of greater diameter than the throats or openings of the valve, it is obvious that special provision must be made to admit of their introduction into the case or body. This is the case, not only with my valve, but with all valves of this class in which the sliding plates are employed. This end of admitting l cover, rendered the valves much heavier than would otherwise be necessary, and also added to the labor and cost of nishing them up in the course of manufacture. The interior of the valve could not be examined while there was a head of steam or water against it.

The object of my invention is to dispense with the enlarged circular end on tli'eregrtension of the body, and .thereby to render" the valve lighter, cheaper, and -more pleasing in appearance, and also to permit access to the interior of the valve while it is in use. vThese results I accomplish by making the opening, through which the valve-plates are introduced, in thee-sidey -instead of tlie-,end ofthe portion d of the c'ase or body, as shown (in Figs. 1, 2, and 3. The outer end of the p'mtigli'd is lei't solid and unbroken,"except where the valvestem passes 1through, and is made of such size and shape that it just permits the valve-plates to slide n'pgintoit clear of their seats, the object being tol dispense with as muchmetal as possible.andrender this portion of the body light. andY offaplieusing and symmetrical form. The opening through which to insert the plates is made in the side and closed by a cap or cover, H, screwing therein, as shown in Figs. 1, 2, and 3. The opening may be made in either side of the portion d, as desired. It is preferably made of a circular form and closed by the screw-cap or cover H, as shown, but it may bemade of any otherform which will admit the plates; and of whatever form made, it may be closed by a cover bolted, keyed, or other- Wise secured in place. While it is preferred, for various reasons, to make the portion d of the form represented, it may be made of any other form desired, provided the opening for the admission of the plates is in one of the four sides or faces. When the opening is made in the wide face or side of the portion d of a circular form, as shown, the plates may 2 Maase be inserted flatwise therein, but a narrower opening may be made in one of the narrow sides, and the valve-plates inserted edgewise.

The great feature of importance is inserting the valve-plates through one of the sides of the portion or extension d, instead of through its end, as usual. The form of the opening, and the manner of securing the cover, are matters of secondary importance. Another great advantage of the side opening, in addition to those above named, is that, when the valve is closed against a head of steam or water, its whole interior may be exposed to view by rcmovin g the cover. Itis obvious my method of constructing the bodyis applicable to all valves otl this class, with sliding valve-plates, no matter how they are arranged and operated.

In my present valve the operating parts are the two, valve-plates C and D, the brace E between them, and the screw-stem F, by which they are moved. rlhe screw-stem extends out through a stuffing-box in the end of the extension el of the case, and is provided with a collar, e, to prevent it from moving endwise, and with a hand-wheel by which to turn it, as usual. At its inner end the screw-stem passes through a nut or arm, f, formed rigidly on the back of the plate C, at or near its upper or outer edge7 as shown in Figs. 1 and 3, so that by turning the screw the plate C may be moved in either direction. The brace E stands in an inclined or oblique position between the two valveplates, and has its ends supported in seats or bearings on the back of the plates, as shown. That end which bears against the plate D is made of a spherical form and seated in a corresponding cavity in the plate, in order that the latter may tip freely in any direction to bear tightly on its se'at or throat in the case or body. The spherical end of the brace also permits the plate D to turn or rotate thereon, so that the wear will be rendered nearly uniform on all portions of its face. The end g of the brace which bears against the plate C is made eccentric or cam-shaped, and mounted in an inclined seat or bearing, h, formed on the back of the plate, as shown in Figs. 1, 3, and 10, for a purpose hereinafter explained. This end of the brace is forked or split, as shown in Fig. 9, so that when the valve is opened it rides up astride of the screw-stem, as shown in Fig. 3. rlhe brace is provided with a lip, t', which, when the valve is open in the least, bears against the side of the screw, as shown in Fie'. 3, so as to hold the brace in its inclined position, and prevent it from straightening up and forcing the valveplates apart. The plate C is provided on its back with four arms or studs, 7c, extending toward the plate D for the purpose of preventing the latter from tipping too far when the valve is open. The two arms at the inner or lower side of the plate G also answer another purpose--that of carrying or sliding the plate D outward as the valve opens. The plate D is provided on its back with an annular flange,

l, as shown in Figs. 1 and 3. Vhen in opening the valve the brace E is tipped so as to allow the plates to fall away from their seats, the flange l of plate D drops down behind the two inner arms K of plate C, as shown in Fig. 3, so that as the plate C is drawn back by the screw the arms 7c carry the plate D back also. Under ordinary circumstances the valve is arranged, as shown in Figs. l and 3,

in a horizontal position, with the plate D uppermost. Vhen the valve is open the various parts are in the positions shown in Fig. 3, the valve-plates being drawn up in the extension d of the body, and the brace resting a-stride of the screw-stem, with the lip t' of the brace bearing against the screw so as to hold the brace in an inclined position and prevent it from straightening up and' forcing the plates apart in case any of the parts bind or meet with obstructions. Upon turning the screw-stem in the proper direction it will slide the valve-plate C inward toward its seat. rlhe plate G will carry with it the brace E, which will in turn carry the valve-plate D, the brace being held in position and prevented from tipping by its lip bearing on the screwstem. The plate D stands a little in advance of the plate4 C, and is brought to a stop in front of its seat by coming in contact with a shoulder, m, in the case or body before the plate C is fairly home, opposite its seat. Vh'en the plate D stops, it becomes a fixed bearing or fulcrum for the spherical end of the brace. At the instant this stoppage occurs, the lip 'i passes off from the end of the screw-stem and leaves the brace free to tip or swing, so that as the screw continues to move the plate (l inward, the latter straightens the brace up between the two plates, which are thereby forced apart tightly against their seats, as shown in Fig. l. Vhen the motion of the screw is reversed, it slides the plate C outward and tips the brace so that the plates are permittedl to fall away from their seats. lip ofthe brace then rides up on the screw, the inner arms 7c of the plate C engage with the fiange l of the plate D, and the plates and brace all slide outward together. As the brace is straightened up to force the plates apart, its eccentric or cam-shaped head, rocking in the inclined seats, moves the brace endwise and thereby forces the plates apart more rapidly and to a greater extent than would otherwise be the case. Another advantage resulting from the use of the eccentric head on the brace is, that as the head rolls in its inclined seat its point of bearing changes or shifts backward, so that the brace may be tipped a greater distance than could'otllerwise be done without passing the center. In order to prevent the eccentric head from slipping in its seat, it may be provided with teeth or cogs, working in corresponding cogs in the seat. In constructing the valve the eccentric head on the brace may be used with a at seat, but not with as good results as the i11- rllhe l clined seat. When the inclined seat is used, the brace is moved endwise a distance equal to the rise of both the head and the seat, Whereas if a fiat seat is used it would not, like the inclined one, aid by moving the brace endwise. The brace may be used in connection with a single valve-plate by forming a seat or shoulder in the case'or body to support one of its ends.

Having thus described my invention, what I claim is l 1. The valve-body A, having an opening for the admission of the valve-plates made in one side of the extension d, and closed by a cover, H, as shown and described. 

